Light Emitting Display Device Asymmetric Viewing Angle Control
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Solution Overview
Problem
Conventional light emitting display devices face challenges in achieving improved luminous efficiency and power consumption reduction while maintaining an asymmetric viewing angle, particularly for privacy protection and specific application fields like smart watches.
Innovation Solution
The implementation of a light emitting display device with a substrate featuring sub-pixels, a light shielding pattern, and a lens system where the light shielding pattern is designed to restrict viewing angles by being open in one direction, and the lens, typically half-cylindrical, refracts light to enhance emission performance at specific angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a conventional light emitting display device is used, then light is emitted in all directions, but this results in poor privacy protection and reduced luminous efficiency at specific viewing angles
Solution Approach 1:
The patent applies asymmetry by using a light shielding pattern with a U-shape opening in one direction and a half-cylindrical lens with asymmetric curvature. This asymmetric configuration redirects light preferentially in a specific viewing angle direction, improving luminous efficiency for the intended viewing angle while restricting light emission in other directions, thereby achieving both energy efficiency and privacy protection.
Solution Approach 2:
The light shielding pattern is segmented into multiple light shielding portions that selectively block light in different directions. The U-shape configuration creates distinct open and blocked regions, allowing precise control over light emission angles. This segmentation enables the device to emit light efficiently in the desired direction while blocking unwanted directions.
2Loss of energy
If the viewing angle is restricted for privacy protection, then luminous efficiency improves, but the device complexity increases due to additional light shielding patterns and lens structures
Solution Approach 1:
The patent merges the light shielding function and light redirection function into a single integrated structure. The light shielding pattern and half-cylindrical lens are combined such that the lens is positioned on top of the light shielding pattern, allowing both components to work together synergistically to control light emission while reducing the number of separate elements needed.
Solution Approach 2:
The light shielding pattern serves multiple functions: it blocks light in unwanted directions, redirects light toward the desired viewing angle, and works in conjunction with the lens to enhance light emission control. This multi-functionality reduces the need for additional separate components, thereby managing device complexity while achieving energy efficiency.
3Object-affected harmful factors
If a light shielding pattern and lens are added to control viewing angles, then privacy protection improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent transitions from a two-dimensional light shielding pattern to a three-dimensional structure by adding a half-cylindrical lens with curvature in the vertical dimension. This dimensional change allows the lens to redirect light over a wider angular range, improving privacy protection while the curved surface provides tolerance to minor alignment variations, slightly reducing manufacturing precision requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively moves or expands the viewing angle in desired directions, improving luminous efficiency and reducing power consumption, while protecting privacy by limiting certain viewing angles.
Implementation Method 1
a lens which is disposed on the light shielding pattern so as to correspond to the emission area and refracts light from the emission area
Data Source
AI summary
Provided is a light emitting display device. The light emitting display device includes a substrate in which a plurality of sub pixels is defined. The device includes an anode disposed on the substrate and disposed so as to correspond to each of the plurality of sub pixels. The device includes an emission layer disposed on the anode, a cathode disposed on the emission layer, a bank covering an edge of the anode to define an emission area, an encapsulation layer disposed on the cathode. The device also includes a light shielding pattern disposed on the encapsulation layer and enclosing a part of the emission area with respect to a plane. The device further includes a lens which is disposed on the light shielding pattern so as to correspond to the emission area and refracts light from the emission area.